Problem on evo 128x32

[dom69]

Hi all,

A customer has a problem with an evo 128x32, before sending it I say that it has been tried and worked fine.

thanks in advance

Dom

[SteveNZ]

How are they powering the display?

 

[lucky1]

Those panels are killed by connecting 12V to the 5V connector on the pin2dmd.

[dom69]

hi Joerg,

I was suspecting the answer but wanted to be sure.  thank you ?

[dom69]

then result.

 he was lucky, the card got nothing, only the two panels died

[dzorbas]

As Lucky1 told me many months ago, the safe thing to do is remove the 5v connector from the BOM when you order the boards. That way PCBway or whoever you order your boards from will not install a connector there. I had one person do the same thing. Destroyed the LED panels. I believe the 5v connector is there for a specific use but I've never needed it and I have ordered a large number of boards.

 

[dom69]

 on all my cards there is a key on my male connector.  we cannot put it on the 5 volt one.

[lucky1]

I updated the EVO design on github and pcbway to avoid killing the panels when 12V get connected to the 5V connector.
I simply run the 5V input through the DC-DC converter now. 

[dom69]

ok very good thank you

[dzorbas]

20 hours ago, dom69 said:

 on all my cards there is a key on my male connector.  we cannot put it on the 5 volt one.

There is on mine as well. I've still seen people do strange things and plug them in the wrong way.

The design change that Lucky1 incorporated is the safest bet. Thanks for doing that!

 

[dom69]

if you do like that we can't put the connector on the 5v.  all my panels go like this